Hogwarts also has a Deputy Headmaster or Deputy Headmistress (depending on gender) that assists the headmaster in his duties. In the event of a headmaster's incapacitation, the deputy headmaster serves as temporary headmaster until the Board of Governors can elect a new, permanent one. There can also be more than one deputy headmaster, as the Carrow siblings served under Severus Snape when Voldemort takes over Hogwarts.

Dolores Umbridge (1996) (Note: though Umbridge was proclaimed headmistress, she was not acknowledged as such by the headmaster's office, which shut her out for the remainder of the year. In addition, her portrait does not hang in the headmaster's office.)